web3-polymarket

Q: How do I install web3-polymarket?

Run npx skills add https://github.com/polymarket/agent-skills --skill web3-polymarket in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/web3-polymarket/ (personal) or .claude/skills/web3-polymarket/ (project).

by polymarketBusiness & Finance

Polymarket integration for prediction market trading on Polygon. Covers authentication (L1 EIP-712, L2 HMAC-SHA256, builder headers), order placement (GTC/GTD/FOK/FAK, batch, post-only, heartbeat), market data (Gamma API, Data API, orderbook, subgraph), WebSocket streaming (market/user/sports channels), CTF operations (split, merge, redeem, negative risk), bridge (deposits, withdrawals, multi-chain), and gasless relayer transactions. Use when building AI agents, autonomous market makers, prediction market UIs, or any application integrating with Polymarket on Polygon.

Installs: 579
Last 24h: —
Trending rank: —
Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/polymarket/agent-skills --skill web3-polymarket

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads web3-polymarket automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Polymarket Skill

When to use this skill

Use this skill when the user asks about or needs to build:

Polymarket API authentication (L1/L2, API keys, HMAC signing)
Placing or managing orders (limit, market, GTC, GTD, FOK, FAK, batch, cancel)
Reading orderbook data (prices, spreads, midpoints, depth)
Market data fetching (events, markets, by slug, by tag, pagination)
WebSocket subscriptions (market channel, user channel, sports)
CTF operations (split, merge, redeem positions)
Negative risk markets (multi-outcome, conversion, augmented neg risk)
Bridge operations (deposits, withdrawals, multi-chain)
Gasless transactions (relayer client, order attribution)
Builder program integration (order attribution, API keys, tiers)
Polymarket SDK usage (TypeScript @polymarket/clob-client, Python py-clob-client)

API Configuration

API	Base URL	Auth	Purpose
CLOB	`https://clob.polymarket.com`	L2 for trade endpoints	Orderbook, prices, order submission
Gamma / Data	`https://gamma-api.polymarket.com`	None	Events, markets, search
Data API	`https://data-api.polymarket.com`	None	Trades, positions, user data
WebSocket (Market)	`wss://ws-subscriptions-clob.polymarket.com/ws/market`	None	Real-time orderbook
WebSocket (User)	`wss://ws-subscriptions-clob.polymarket.com/ws/user`	API creds in message	Trade/order updates
WebSocket (Sports)	`wss://sports-api.polymarket.com/ws`	None	Live scores
Relayer	`https://relayer-v2.polymarket.com/`	Builder headers	Gasless transactions
Bridge	`https://bridge.polymarket.com`	None	Deposits/withdrawals

Contract Addresses (Polygon)

Contract	Address
USDC (USDC.e)	`0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174`
CTF (Conditional Tokens)	`0x4D97DCd97eC945f40cF65F87097ACe5EA0476045`
CTF Exchange	`0x4bFb41d5B3570DeFd03C39a9A4D8dE6Bd8B8982E`
Neg Risk CTF Exchange	`0xC5d563A36AE78145C45a50134d48A1215220f80a`
Neg Risk Adapter	`0xd91E80cF2E7be2e162c6513ceD06f1dD0dA35296`

Client Setup

TypeScript

import { ClobClient, Side, OrderType } from "@polymarket/clob-client";
import { Wallet } from "ethers"; // v5.8.0

const HOST = "https://clob.polymarket.com";
const CHAIN_ID = 137;
const signer = new Wallet(process.env.PRIVATE_KEY);

// Step 1: L1 — derive API credentials
const tempClient = new ClobClient(HOST, CHAIN_ID, signer);
const apiCreds = await tempClient.createOrDeriveApiKey();

// Step 2: L2 — init trading client
const client = new ClobClient(
  HOST,
  CHAIN_ID,
  signer,
  apiCreds,
  2,                // signatureType: 0=EOA, 1=POLY_PROXY, 2=GNOSIS_SAFE
  "FUNDER_ADDRESS"  // proxy wallet address from polymarket.com/settings
);

Python

from py_clob_client.client import ClobClient
import os

host = "https://clob.polymarket.com"
chain_id = 137
pk = os.getenv("PRIVATE_KEY")

# Step 1: L1 — derive API credentials
temp_client = ClobClient(host, key=pk, chain_id=chain_id)
api_creds = temp_client.create_or_derive_api_creds()

# Step 2: L2 — init trading client
client = ClobClient(
    host,
    key=pk,
    chain_id=chain_id,
    creds=api_creds,
    signature_type=2,  # 0=EOA, 1=POLY_PROXY, 2=GNOSIS_SAFE
    funder="FUNDER_ADDRESS",
)

Quick Reference: Order Types

Type	Behavior	Use Case
GTC	Rests on book until filled or cancelled	Default limit orders
GTD	Active until expiration (UTC seconds). Min = `now + 60 + N`	Auto-expire before events
FOK	Fill entirely immediately or cancel	All-or-nothing market orders
FAK	Fill what's available, cancel rest	Partial-fill market orders

FOK/FAK BUY: amount = dollar amount to spend
FOK/FAK SELL: amount = number of shares to sell
Post-only: GTC/GTD only — rejected if would cross spread

Quick Reference: Signature Types

Type	Value	Description
EOA	`0`	Standard Ethereum wallet (MetaMask). Funder is the EOA address and will need POL for gas.
POLY_PROXY	`1`	Custom proxy wallet for Magic Link email/Google users who exported PK from Polymarket.com.
GNOSIS_SAFE	`2`	Gnosis Safe multisig proxy wallet (most common). Use for any new or returning user.

Core Pattern: Place an Order

TypeScript

const response = await client.createAndPostOrder(
  {
    tokenID: "TOKEN_ID",
    price: 0.50,
    size: 10,
    side: Side.BUY,
  },
  {
    tickSize: "0.01",  // from client.getTickSize(tokenID) or market object
    negRisk: false,    // from client.getNegRisk(tokenID) or market object
  },
  OrderType.GTC
);
console.log(response.orderID, response.status);

Python

from py_clob_client.clob_types import OrderArgs, OrderType
from py_clob_client.order_builder.constants import BUY

response = client.create_and_post_order(
    OrderArgs(token_id="TOKEN_ID", price=0.50, size=10, side=BUY),
    options={"tick_size": "0.01", "neg_risk": False},
    order_type=OrderType.GTC,
)
print(response["orderID"], response["status"])

Core Pattern: Read Orderbook

TypeScript

// No auth needed
const readClient = new ClobClient("https://clob.polymarket.com", 137);
const book = await readClient.getOrderBook("TOKEN_ID");
console.log("Best bid:", book.bids[0], "Best ask:", book.asks[0]);

const mid = await readClient.getMidpoint("TOKEN_ID");
const spread = await readClient.getSpread("TOKEN_ID");

Python

read_client = ClobClient("https://clob.polymarket.com", chain_id=137)
book = read_client.get_order_book("TOKEN_ID")
mid = read_client.get_midpoint("TOKEN_ID")
spread = read_client.get_spread("TOKEN_ID")

Core Pattern: WebSocket Subscribe

const ws = new WebSocket("wss://ws-subscriptions-clob.polymarket.com/ws/market");

ws.onopen = () => {
  ws.send(JSON.stringify({
    type: "market",
    assets_ids: ["TOKEN_ID"],
    custom_feature_enabled: true,
  }));
  // Send PING every 10s to keep alive
  setInterval(() => ws.send("PING"), 10_000);
};

ws.onmessage = (event) => {
  if (event.data === "PONG") return;
  const msg = JSON.parse(event.data);
  // msg.event_type: "book" | "price_change" | "last_trade_price" | "tick_size_change" | "best_bid_ask" | "new_market" | "market_resolved"
};

Reference files (load on demand)

Only read these when the task requires deeper detail on a specific topic:

Authentication (L1/L2, builder headers, credential lifecycle): authentication.md
Order patterns (GTC/GTD/FOK/FAK, tick sizes, cancel, heartbeat, errors): order-patterns.md
Market data (Gamma API, Data API, CLOB orderbook, subgraph): market-data.md
WebSocket (market/user/sports channels, subscribe, heartbeat): websocket.md
CTF operations (split, merge, redeem, neg risk, token IDs): ctf-operations.md
Bridge (deposits, withdrawals, supported chains/tokens, status): bridge.md
Gasless transactions (relayer client, wallet deployment, builder setup): gasless.md

FAQ

What does the web3-polymarket skill do?

How do I install web3-polymarket?

Run npx skills add https://github.com/polymarket/agent-skills --skill web3-polymarket in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/web3-polymarket/ (personal) or .claude/skills/web3-polymarket/ (project).

Which AI agents can use web3-polymarket?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is web3-polymarket safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains web3-polymarket?

It is published by polymarket in polymarket/agent-skills. It has 579 recorded installs.

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web3-polymarket

Install

Install

Describe the task

Review the result

SKILL.md

Polymarket Skill

When to use this skill

API Configuration

Contract Addresses (Polygon)

Client Setup

TypeScript

Python

Quick Reference: Order Types

Quick Reference: Signature Types

Core Pattern: Place an Order

TypeScript

Python

Core Pattern: Read Orderbook

TypeScript

Python

Core Pattern: WebSocket Subscribe

Reference files (load on demand)

FAQ

Popular business & finance skills

sales-enablement

revops

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cross-border-ecommerce

pricing-strategy